Interchain coupling in polyacetylene
Danielsen, P. L. and Ball, Robin. (1985) Interchain coupling in polyacetylene. Journal de Physique, Vol.46 (No.2). pp. 131-137. ISSN 0302-0738Full text not available from this repository.
Official URL: http://dx.doi.org/10.1051/jphys:01985004602013100
The interchain coupling between two polyacetylene chains is considered, both in the absence of solitons, and with one neutral soliton on each chain. A new correction to the size and position of the band gap is found in the former case, and when solitons are present it is shown that their mid-gap levels interact. In this case the differences between the matched (same dimerization pattern at ± ∞) and the mismatched cases (opposite pattern at ± ∞) are clearly illustrated. The mid-gap level splitting is found to be ΔE = t> l/ξ sinh l/ξ, in the matched case, and ˜ 0(e-kfξ) in the mismatched case (where l is the soliton separation, kf the Fermi wavevector, ξ the soliton width, and  kf ξ ˜ 10). This interaction increases the strength of the 3 D pinning of solitons, there-fore strengthening the case against the solitonic model for conduction in polyacetylene. It also predicts the existence of a critical density ρc ˜ 0.05 of solitons, at which the preferred local ordering between chains switches from mismatched to matched dimerization.
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Divisions:||Faculty of Science > Physics|
|Library of Congress Subject Headings (LCSH):||Polyacetylenes, Organic semiconductors, Solitons, Energy gap (Physics), Energy-band theory of solids|
|Journal or Publication Title:||Journal de Physique|
|Page Range:||pp. 131-137|
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